Observation of Dynamical Fermionization
Quantum Gases
2020-03-30 v1 Atomic Physics
Abstract
We observe dynamical fermionization, where the momentum distribution of a Tonks-Girardeau (T-G) gas of strongly interacting bosons in 1D evolves from bosonic to fermionic after its axial confinement is removed. The asymptotic momentum distribution after expansion in 1D is the distribution of rapidities, which are the conserved quantities associated with many-body integrable systems. Rapidities have not previously been measured in any interacting many-body quantum system. Our measurements agree well with T-G gas theory. We also study momentum evolution after the trap depth is suddenly changed to a new non-zero value. We observe the predicted bosonic-fermionic oscillations and see deviations from the theory outside of the T-G gas limit.
Cite
@article{arxiv.1908.05364,
title = {Observation of Dynamical Fermionization},
author = {Joshua M. Wilson and Neel Malvania and Yuan Le and Yicheng Zhang and Marcos Rigol and David S. Weiss},
journal= {arXiv preprint arXiv:1908.05364},
year = {2020}
}